Meanwhile, I was bothered by the black knobs on my Prima rear cowl protectors, and went looking for a replacement. I found them in the badged, cast and polished aluminum accessory knobs by Royal Enamel. There is a ton of vintage style badges, and an email to the UK Ebay seller advised me that they are threaded M8, not M7 as listed in the auction. I was happy about this as the ugly, stock black knobs are M8 I ordered 4 and they arrived yesterday. Here is a link to the ebay auction for the knobs I ordered:
http://www.ebay.com/itm/180913716914?ss ... 1439.l2649
I was very pleased with the quality, and the looked really sharp. Next I purchased 4 M8 bolts, and cut off a 30mm long threaded section with a dremel cutoff tool. A little locktight, and 30 minutes later and I had fancy new vintage style knobs. As these knobs are about 5mm larger than the black ones, I had to open up the mounting holes on the rear of the crash bars, but this was easy to do.
Below are a few pics showing firt the black knobs, then the new vintage style in their place:
First the front:


and the rear:


This was about a 20 minute project, and I feel it was quite worth the trouble.